Is the Serta Perfect Sleeper Twin good for side sleepers?

Mostly no. It is a firm mattress, and side sleepers usually need a softer surface to cushion the shoulder and hip. Back and stomach sleepers are the better fit.

It is designed not to. The Cool Twist gel memory foam and CoolFeel fabric cover are meant to pull heat away, and owners generally report it sleeps cooler than all-foam beds.

Does it come with a foundation?

Yes, a foundation is included. Check that the twin foundation matches your bed frame height before setup.

How does it compare with an all-foam mattress?

It is bouncier and easier to move on, with more edge structure from the coils. An all-foam bed will absorb motion better and feel softer.

Is the twin size right for an adult?

A twin fits one adult or a child. Couples or anyone who moves a lot in sleep should look at a full or queen.

What is inside the mattress?

An 825-coil innerspring core topped with Cool Twist gel memory foam and PillowSoft Aire foam under a CoolFeel tight-top cover, with antimicrobial treatment in the fill.